Anything with a perk price has an advantage over anything that does not.
Mainly, they are hard to kill. Take the 262 for example. It is perked so heavily because it moves so fast. It is hard to catch and kill.
Take the Tempest for example. It is perked higher then the other planes because it moves so fast. It is hard to kill.
Now take the Tiger for example. It is perked so heavily because it is resistant to most bombs and shots. You need to be precise shooting it with another tank or dropping a bomb on it to kill it.
It will take no skill to shoot a Tiger with a Ju87g.
You can try it yourself. Up a Hurricane Mk2D. Fly it out and try to shoot a tank with the 40's. It's easy to hit a tank, but it's hard to do any damage.
This is not true of the Ju87. It will be easy to hit a tank, and WILL do damage.
Remember, the F4u1c was perked because of it's affect on the arena, not because it's a super plane.